EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, in which quantity of addition for urea or ammonium to an NOx catalyst, in case of an ammonium added type, can be controlled properly without lack or excess. SOLUTION: In a high temperature range wh...

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Bibliographische Detailangaben
Hauptverfasser:	SHINOZAKI RITSUKO, SAITO SHINICHI, TAKAHASHI YOSHINORI, TAKEDA YOSHIHISA, KAWATANI SEI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, in which quantity of addition for urea or ammonium to an NOx catalyst, in case of an ammonium added type, can be controlled properly without lack or excess. SOLUTION: In a high temperature range where catalyst temperature Tc is higher than prescribed temperature T1, map control is executed to set the quantity of addition Qnd for ammonium (NH3) based on a map (S28-S32). In a low temperature range of the prescribed temperature T1 or lower, sensor control is executed to set the quantity of addition Qnd for ammonium based on information from upstream side and downstream side NOx sensors (S18-S22). COPYRIGHT: (C)2005,JPO&NCIPI